Caterpillar CG170B-20 vs MTU 20V4000 GS
The Caterpillar CG170B-20 and MTU 20V4000 GS are both natural gas generator engines in a similar power class. The MTU 20V4000 GS is the higher-output unit (3,169 kVA vs 2,875 kVA). Displacement is 88.5 L versus 95.3 L. The table below compares their full specifications side by side.
| Specification | Caterpillar CG170B-20 | MTU 20V4000 GS |
|---|---|---|
| Headline rating | 2,875 kVA | 3,169 kVA |
| Standby (50 Hz) | — | — |
| Prime (50 Hz) | 2,300 kWe | 2,535 kWe |
| Standby (60 Hz) | — | — |
| Prime (60 Hz) | 2,300 kWe | — |
| Displacement | 88.5 L | 95.3 L |
| Configuration | V20 | V20 |
| Cylinders | 20 | 20 |
| Rated speed | 1,500 / 1,800 RPM | 1,500 RPM |
| Fuel | Natural Gas | Natural Gas |
| Cooling | Liquid-Cooled | Liquid-Cooled |
| Emissions | Unregulated | Unregulated |
| Dry weight | — | — |
| Origin | Germany | Germany |
Choosing between Caterpillar CG170B-20 and MTU 20V4000 GS
Use this comparison as an engineering shortlist, then confirm the complete generator package against load profile, voltage, 50/60 Hz frequency, duty class, emissions rules, cooling margin, altitude, ambient temperature, enclosure design, controller features, and alternator sizing. The MTU 20V4000 GS has the higher headline kVA rating in this pair, but site conditions and duty cycle can still change the final recommendation.